I was in a very suspect match with a player who had 300+ ping for the first 20min or so. My team member wasn't really trying hard complaining about the lag. Many times I considered just leaving but I remembered reading of others increasing their ping to try to force people to quit.
So I stuck it out and won, however my suspicions seem to be correct after looking at the high ping erebus player history.
http://pantheon.demigodthegame.com/games/player/60954/
Most all of his games are where others left the match, likely b/c of lag. He had a few games in a row with his partner loewe2 who played like an AI TB.